Connected: An Internet Encyclopedia
RFC 1661 - 1.1. Specification of Requirements

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### 1.1. Specification of Requirements

In this document, several words are used to signify the requirements of the specification. These words are often capitalized.

       MUST      This word, or the adjective "required", means that the
                 definition is an absolute requirement of the specification.

       MUST NOT  This phrase means that the definition is an absolute
                 prohibition of the specification.

       SHOULD    This word, or the adjective "recommended", means that there
                 may exist valid reasons in particular circumstances to
                 ignore this item, but the full implications must be
                 understood and carefully weighed before choosing a
                 different course.

       MAY       This word, or the adjective "optional", means that this
                 item is one of an allowed set of alternatives.  An
                 implementation which does not include this option MUST be
                 prepared to interoperate with another implementation which
                 does include the option.

Next: 1.2. Terminology

Connected: An Internet Encyclopedia
RFC 1661 - 1.1. Specification of Requirements